Most men will notice a firmer and longer-lasting erection. If the treatment does not work, ask our doctors (or your own GP), whether it would be appropriate to increase the dose. Alternatively, they may recommend another treatment.

If Cialis doesn’t work for you first time round, it could nevertheless be more effective next time. Doctors often advise trying all erectile dysfunction medicines eight times before giving up.

., including Indinavir and Ritonavir

They are using anti-fungal treatments like Itraconazole or Ketoconazole

They are using recreational drugs such as amyl nitrate (poppers)

They are taking alpha-blockers often used in the treatment of prostate enlargement and high blood pressure such as Doxazosin, Prazosin, Alfuzosin, Terazosin, Indoramin and Tamsulosin

Dr Fox cannot supply Cialis to men where the above are present.

Cialis should not be taken at the same time or within 36 hours of taking Viagra/sildenafil, Levitra, or Spedra.

Daily versus Cialis '36 hours'

Most men take Cialis as and when they need it, usually 10mg or 20mg, which is effective for up to 36 hours.

Men who need erectile dysfunction treatment two or more times a week should consider taking a regular low dose Cialis tablet daily. Cialis 2.5mg or 5mg tablets taken every day will provide continuous erectile dysfunction treatment, without peaks and troughs.